A. Make items at the same level have the same grammar/tenses.
B. Use full sentences when possible.
1. Use the conventional system of numbering (such as the one being demonstrated now).
2. Always include at least two items per level.
a. Use as few major sections (I., II., III., etc.) as possible.
b. If the list gets too long, try clustering the items into broader categories with more subcategories.